Trailer
 | John Vernon as David Hunter / Praetorius |
 | Steve Ihnat as Alain Praetorius |
 | Sabrina Scharf as Anne Novak |
 | Edward Binns as Owen Larkdale |
 | Fritz Weaver as Cirrak |
 | Ramon Bieri as Mishani |
 | John Schuck as McDaniel |
 | Barbara Rhoades as Real Estate Woman |
 | Roger Bowen as Alfred Blount |
 | Woodrow Parfrey as Tyson |
 | Lonny Chapman as Albert Treadway |
 | Ed Flanders as Dr. Miles |
 | Sheldon Allman as Dr. Abrams |
 | J. David Jones as Lubbock |
| Tony Van Bridge as Griggs |
 | Lawrence Cook as Donnelly |
| Walter Stocker as Gunner |
 | Jerry Douglas as Gen. Rollins |
 | Peggy Rea as Helen Shaw's Friend |
 | Bill Erwin as Sam Pickering |
| Nicky Blair as Mr. Wilson |
 | Marcy Lafferty as Scientist Wearing Gas Mask |
 | Jason Wingreen as Mr. Lubbock |
 | Paul Comi as Wilson (uncredited) |
| Production | |
| Bruce Geller | Producer |
Directing | |
| Leonard Horn | Director |
Writing | |
| Cliff Gould | Writer |
Sound | |
| Lalo Schifrin | Music |
Crew | |
| Bruce Geller | Creator |
Camera | |
| Jerry A. Sims | Director of Photography |
Editing | |
| Patrick Kennedy | Editor |
| Melvin Shapiro | Editor |
Art | |
| Allen E. Smith | Production Design |
Crew | |
| Hubie Kerns Jr. | Stunts |
